Vascular Plants

Includes all flowering plants, conifers, ferns and fern-allies.


Browse by scientific name:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
Scientific names beginning with L:
Laburnum anagyroidisgolden chain-tree
Distribution: Occurring chiefly west of the Cascades crest at low elevations in Washington; British Columbia south to California, Utah.
Habitat: Disturbed sites often in proximity to residential development where escaped from cultivation.
Origin: Introduced
Flowers: May-June
Lactuca biennistall blue lettuce, wild blue lettuce
Distribution: Alaska to Newfoundland, south to California and North Carolina.
Habitat: Moist places.
Origin: Native
Flowers: July - August
Lactuca canadensisCanadian wild lettuce, Florida blue lettuce
Distribution: Widespread in eastern United States; occasionally introduced in the Pacific Northwest.
Habitat: Fields, woodlands and waste places.
Origin: Introduced from eastern North America
Flowers: July - September
Lactuca ludovicianaLouisiana lettuce, prairie lettuce, western lettuce
Origin: Introduced
Flowers: July - September
Lactuca salignaleast lettuce, willow lettuce
Distribution: Occurring in scattered locations in Washington; Washington south to California, east across the southwestern U.S. to the central U.S. and northeastern North America.
Habitat: Disturbed areas, roadsides, and meadows.
Origin: Introduced
Flowers: August-October
Lactuca sativagarden lettuce
Distribution: Occurring in scattered locations in Washington; Washington south to California, east to Idaho; in scattered locations in the central U.S., more commonly distributed in eastern North America.
Habitat: Disturbed areas, often escaping from cultivation.
Origin: Introduced
Flowers: July-September
Lactuca serriolaprickly lettuce
Distribution: Occurring on both sides of the Cascades in Washington; common and widespread throughout much of North America.
Habitat: Fields and waste places.
Origin: Introduced from Europe
Flowers: July-September
Lactuca tataricablue lettuce
Origin: Native
ssp. pulchella – blue lettuce
Lactuca virosagreat lettuce, tall lettuce, wild lettuce
Distribution: Known from Puget Trough region in Washington; also in California, Mississippi, and Maryland.
Habitat: Disturbed, open areas at low elevations including wastelots and roadsides.
Origin: Introduced
Flowers: May-October
Ladeania lanceolatawild lemonweed, lance-leaf scurf pea, scurf-pea
Distribution: East of the Cascades in Washington, mostly in the central and southcentral areas of the state; Washington south to California, east to the central regions of Canada and the U.S.
Habitat: Sagebrush steppe habitat in dry areas, often where sandy.
Origin: Native
Flowers: May-June
Lagophylla ramosissimaslender hareleaf, common rabbitleaf
Distribution: Occurring east of the Cascades in Washington; Washington south to California, east to Montana, Idaho, and Nevada.
Habitat: Dry, open areas of foothills and plains.
Origin: Native
Flowers: May-July
Lallemantia peltatalion's heart
Origin: Introduced
Lamiastrum galeobdolonyellow archangel
Distribution: West of the Cascades in Washington; California and scattered localities in eastern U.S.
Habitat: Introduced as an ornamental, escaping in lowland forest understory and disturbed soil in shaded areas.
Origin: Introduced from Eurasia
Flowers: May-June
Lamium album
Origin: Introduced
Lamium amplexicaulecommon dead-nettle, giraffehead
Distribution: Both sides of the Cascades in Washington; introduced and widespread in North America; Eurasia and North Africa.
Habitat: Weed in distrurbed areas, fields, lawns.
Origin: Introduced from Eurasia
Flowers: April-July
Lamium hybridumcutleaf dead-nettle
Origin: Introduced from Eurasia
Lamium maculatumspotted hen-nettle, spotted henbit
Distribution: Chiefly west of the Cascades in Washington; Alaska, Oregon, Idaho; eastern North America.
Habitat: Disturbed ground.
Origin: Introduced from Eurasia
Flowers: April - August
Lamium purpureumred dead-nettle, henbit
Distribution: Both sides of the Cascades in Washington, but more common on the west side; introduced throughout North America.
Habitat: Weed in distrurbed areas, fields, lawns at lower elevations.
Origin: Introduced from Eurasia
Flowers: April-July
Lappula fremontiiFremont's stickseed
Origin: Introduced
Lappula longispinalong-spined stickseed
Distribution: East of the Cascades in the Pacific Northwest; Eurasia.
Habitat: A weed in dry, disturbed places, along roadsides and on overgrazed ranges.
Origin: Introduced
Flowers: May - July
Lappula montanamontane stickseed
Origin: Introduced
Lappula occidentaliswestern stickseed
Origin: Introduced
Lappula squarrosabristly sheepburr, bristly stickseed, common stickseed, European stickseed, bristly-fruited tickweed
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America; Eurasia.
Habitat: Shrub-steppe, disturbed areas, roadside.
Origin: Introduced from Eurasia, possibly native in northern Rocky Mts. (Cronquist et al. 1984)
Flowers: June-August
Lapsana communiscommon nipplewort
Distribution: Occurring on both sides of the Cascades crest in Washington, but more often west of the crest; BC to CA, scattered elsewhere in western North America, and more common in central and eastern North America.
Habitat: Disturbed areas including roadsides, wastelots, fields, and forest edge.
Origin: Introduced from Eurasia
Flowers: June-July
Larix lyalliisubalpine larch
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia to the central Cascades and Wenatchee Mountains in Washington, east to Montana and Alberta.
Habitat: Generally near timberline, preferring north-facing slopes.
Origin: Native
Cones: June-July (cone production)
Larix occidentaliswestern larch
Distribution: East of the Cascades, British Columbia to Oregon, east to Montana and Alberta
Habitat: Mountain valleys and lower slopes, often in swampy areas
Origin: Native
Cones: May - June
Lasthenia glaberrimasmooth goldfields, smooth lasthenia
Distribution: West of the Cascades, southwest Washington south to central California.
Habitat: Wet or muddy ground at low elevations, including venral pools.
Origin: Native
Flowers: May-July
Lasthenia maritimamaritime goldfields, seaside goldfields
Distribution: Coastal southern British Columbia to California.
Habitat: Rocky beaches.
Origin: Native
Lasthenia minorcoastal goldfields
Origin: Native
Lathrocasis tenerrimadelicate gilia
Distribution: Known from Okanogan, Douglas, and Chelan counties in Washington; British Columbia south to California, east to Montana, Idaho, Wyoming, Utah and Nevada.
Habitat: Rocky outcroppings, Ponderosa pine forest openings, and montane shrub-steppe communities.
Origin: Native
Flowers: May-June
Lathyrus angulatusangled peavine
Origin: Introduced
Lathyrus aphacayellow vetchling
Distribution: Known only from the San Juan Islands in Washington; Washington south to California, and in scattered locations in central and southern U.S.
Habitat: Disturbed ground.
Origin: Introduced
Flowers: May-July
Lathyrus holochlorusthin-leaf vetchling
Distribution: Occurring west of the Cascades crest in Washington; Washington south to Oregon.
Habitat: Fence rows and partially cleared land.
Origin: Native
Flowers: May-July
Lathyrus japonicusbeach pea
Distribution: Coastal in Washington; Alaska south to California; also along the Atlantic Coast.
Habitat: Sandy beaches, dunes, and headlands along the coast.
Origin: Native
Flowers: May-September
Lathyrus lanszwertiiNevada peavine, thick-leaved peavine
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington south to California, east to Idaho and Utah.
Habitat: Sagebrush-ponderosa pine woodland to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
var. aridus – pinewoods peavine
var. bijugatus – drypark pea
var. lanszwertii – thick-leaved peavine
Lathyrus latifoliuseverlasting-pea
Distribution: Occurring in locations throughout much of Washington; widespread in North America.
Habitat: Found in a variety of disturbed habitats, usually where somewhat moist.
Origin: Introduced
Flowers: May-July
Lathyrus littoralisbeach peavine, silky beach vetchling
Distribution: Occurring in the coastal counties in Washington; British Columbia south to California.
Habitat: Sand dunes and sandy beaches.
Origin: Native
Flowers: May-July
Lathyrus nevadensisSierra peavine
Distribution: Occurring on both sides of the Cascades crest and in the southeast corner of the State; British Columbia south to California, east to Idaho.
Habitat: Open woods at moderate to mid-elevations.
Origin: Native
Flowers: May-July
var. cusickii – Cusick's pea
var. nevadensis – Sierra pea
Lathyrus ochroleucuscream pea
Distribution: Occurring east of the Cascades crest along the northern border in Washington; Alaska south to Washington, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Moist woods, at the edge of thickets.
Origin: Native
Flowers: May-July
Lathyrus palustrismarsh pea
Distribution: Occurring along the Puget Sound and outer coast in Washington; widely distributed throughout most of North America except the Rocky Mountain and southeastern regions of the U.S.
Habitat: Chiefly in tidelands along the coast.
Origin: Native
Flowers: April-July
Lathyrus pauciflorusfew-flowered peavine
Distribution: Occurring chiefly east of the Cascades crest in Washington;, Washington, south to California, east to Idaho and Arizona.
Habitat: Shrub-steppe to Ponderosa pine and higher open forests.
Origin: Native
Flowers: April-June
var. pauciflorus – few-flowered pea
Lathyrus polyphyllusleafy pea
Distribution: Occurring west of the Cascades crest in lowland Washington, and east up the Columbia River Gorge; Washington south to California.
Habitat: Prairies and open areas of low mountains.
Origin: Native
Flowers: May-July
Lathyrus pratensismeadow vetchling
Origin: Native
Flowers: May - July
Lathyrus sphaericusgrass pea
Origin: Introduced
Flowers: May - June
Lathyrus sylvestrisnarrow-leaf pea
Distribution: Occurring chiefly west of the Cascades in Washington.
Habitat: Roadsides and waste places at low elevations.
Origin: Introduced
Flowers: May-July
Lathyrus torreyiTorrey's pea
Distribution: Occurring west of the Cascades crest in Washington; Washington south to California.
Habitat: Open prairies and clearings in the woods at low elevations.
Origin: Native
Flowers: May-July
Lathyrus tuberosusearth-nut pea
Origin: Introduced
Flowers: May - July
Lathyrus vestitus
Origin: Native
Flowers: April - June
var. ochropetalus – Pacific peavine
Lavandula ×intermedia
Origin: Introduced
Lavandula stoechas
Origin: Introduced
Layia glandulosawhite layia, white daisy tidytips
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia south to California, east to Idaho, Utah, Arizona and New Mexico.
Habitat: Dry, open places in the deserts and foothills.
Origin: Native
Flowers: April-June
Leersia oryzoidesrice cut grass
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia east to the Atlantic Coast, south throughout the U.S.
Habitat: Wet places, often in fairly deep water.
Origin: Native
Flowers: July-September
Lemna minorcommon duckweed, lesser duckweed, water lentil
Distribution: Cosmopolitan in temperate and subtropical regions
Habitat: In standing or slow-moving fresh water
Origin: Native
Flowers: June - October
Lemna minutaleast duckweed
Origin: Native
Lemna trisulcaivy duckweed, ivy-leaved duckweed, star duckweed
Distribution: Throughout much of the temperate and subtropical regions of the world.
Habitat: Quiet streams and standing fresh water.
Origin: Native
Flowers: July - September
Lemna turioniferaturion duckweed
Distribution: Occurring in aquatic environments throughout Washington; cosmopolitan in temperate and subtropical regions.
Habitat: In standing or slow-moving fresh water.
Origin: Native
Flowers: June-October
Leontodon autumnalisautumn hawkbit
Distribution: Known from San Juan and Whatcom counties in Washington; Alaska to Oregon, east to Idaho and Montana; also in eastern North America.
Habitat: Roadsides, pastures, open fields and other disturbed areas primarily in the lowlands, but also found along roads at alpine elevations in the mountains (e.g., Mt. Baker area).
Origin: Introduced from Eurasia
Flowers: July-September
Leontodon saxatilishairy hawkbit
Distribution: Occurring in scattered locations in Washington, chiefly west of the Cascades crest; British Columbia south to California, Nevada, and Arizona; central and eastern U.S.
Habitat: Disturbed sites.
Origin: Introduced
Flowers: July-September
ssp. saxatilis – lesser hawkbit
Leonurus cardiacamotherwort, Lion's tail
Distribution: Scattered location in Washington; found occasionally in North America.
Habitat: Disturbed ground, often in association with cities and towns.
Origin: Introduced from Eurasia
Flowers: June-September
Lepidium appelianumglobepodded hoarycress, whitetop
Distribution: Widely distributed throughout many areas in Washington, though more common east of the Cascades crest; widely distributed throughout much of North America.
Habitat: Disturbed soil, waste areas, in dry and moist places.
Origin: Introduced from Asia
Flowers: April-August
Lepidium campestrefield cress, field peppergrass pepperwort
Distribution: Distributed across Washington in scattered locations; distributed throughout much of North America.
Habitat: Dry, disturbed areas.
Origin: Introduced from Eurasia
Flowers: May-July
Lepidium chalepensechalapa hoarycress, lens-podded hoarycress, Asian white-top
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas, especially where dry, often associated with agriculture.
Origin: Introduced from Asia
Flowers: May-June
Lepidium densiflorumcommon peppergrass, elongate peppergrass, hairy-fruited peppergrass, large-fruited peppergrass, prairie peppergrass
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Lepidium dictyotumalkali peppergrass, veiny peppergrass
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho, Nevada, and Utah.
Habitat: Open areas often where seasonally moist, such as vernal ponds; tolerant of alkaline soils.
Origin: Native
Flowers: April-May
Lepidium didymumlesser swinecress, lesser wartcress
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California and Arizona, and Texas eastward and northward to the Atlantic Coast.
Habitat: Roadsides, gardens and wasteland.
Origin: Introduced from South America (or possibly Eurasia)
Flowers: May-July
Lepidium drabaheart-podded hoarycress, hoary pepperwort
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Widespread weed in lowlands.
Origin: Introduced from Eurasia
Flowers: April-August
Lepidium heterophyllumSmith's pepperwort
Distribution: West of the Cascades in Washington; British Columbia south to California; in scattered locations in eastern U.S.
Habitat: Roadsides, pastures, and other disturbed ground.
Origin: Introduced from Europe
Flowers: May-June
Lepidium latifoliumdittander, broad-leaved peppergrass, broad-leaved pepperwort
Distribution: Chiefly east of the Cascades in Washington but also found in the western lowlands; widely distributed throughout central and western North America.
Habitat: Moist areas and irrigated land, but also on drier areas.
Origin: Introduced from Eurasia
Flowers: June-September
Lepidium nitidumshining peppergrass
Distribution: Known from Klickitat County in Washington; Washington south to California.
Habitat: Dry, open areas at low elevation.
Origin: Native
Flowers: March-April
Lepidium oblongum
Origin: Introduced
Lepidium oxycarpumforked pepperwort, sharpfruited pepperwort
Distribution: Chiefly in south-central California, rare in the Pacific Northwest.
Habitat: Usually on saline soil.
Origin: Native
Flowers: March - May
Lepidium perfoliatumclasping-leaved peppergrass, round-leaved peppergrass, yellow-flowered peppergrass, clasping peppergrass pepperwort
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Flowers: March-June
Lepidium ramosissimumbranched peppergrass, dull peppergrass
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout much of western and northern North America.
Habitat: Sagebrush, ponderosa pine forest openings, roadsides, fields, and other disturbed open areas.
Origin: Native
Flowers: June-August
Lepidium sativumgarden cress pepperwort
Origin: Introduced from western Asia
Flowers: April - June
Lepidium strictumupright peppergrass
Origin: Introduced
Lepidium virginicumtall pepperweed
Distribution: Throughout the United States, north to Alaska
Habitat: Weedy native of the lowlands
Origin: Native
Flowers: March - June
ssp. menziesii – coastal peppergrass, hairy peppergrass, Idaho peppergrass, Menzies' peppergrass, tall peppergrass, tall western peppergrass
Leptarrhena pyrolifoliapearleaf, leatherleaf saxifrage
Distribution: Alaska to Oregon, east to Alberta and Montana; in the Olympics and Cascades of Washington
Habitat: Streambanks, seeps and wet meadows, mid- to high elevations in the mountains
Origin: Native
Flowers: June - August
Leptosiphon bicolorbicolored babystars, bicolored linanthus
Distribution: Occurring chiefly west of the Cascades crest in Washington; Vancouver Island, B. C. south to California.
Habitat: Open areas at lower elevations.
Origin: Native
Flowers: April-June
Leptosiphon bolanderiBolander's desert-trumpets, Baker's linanthus
Distribution: Near the east base of the Cascades in Klickitat County, Washington, and in the Sierra Nevada and Coast Range of California.
Habitat: Dry, open places at lower elevations, often on serpentine.
Origin: Native
Flowers: April-May
Leptosiphon harknessiithree-seed desert-trumpets, Harkness' linanthus
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Utah.
Habitat: Drier open places, foothills to mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Leptosiphon liniflorusflax-flower desert-trumpets, thread-stem linanthus, thread-stemmed linanthus
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California.
Habitat: open, dry areas in sagebrush flats to Ponderosa pine forests.
Origin: Native
Flowers: April-June.
Leptosiphon minimustrue babystars
Origin: Native
Leptosiphon nuttalliiNuttall's linanthus
Distribution: In the Cascade and Blue Mountains of Washington; Washington south to California, east to Montana, Colorado and New Mexico.
Habitat: Open rocky slopes at mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
ssp. nuttallii – Nuttall's linanthus
Leptosiphon septentrionalisnorthern desert-trumpets, northern linanthus
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to northern Rocky Mountains and Great Plains.
Habitat: In seasonally wet open plains and slopes from low to moderate elevations.
Origin: Native
Flowers: May-July
Lepyrodiclis holosteoidesFalse jagged-chickweed
Origin: Introduced
Leucanthemum ×superbumShasta daisy
Origin: Introduced
Leucanthemum vulgareoxeye daisy
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Open, disturbed areas including roadsides, pastures, prairies, grasslands and wastelots.
Origin: Introduced from Eurasia
Flowers: May-October
Leucojum aestivumsummer snowflake
Origin: Introduced from Europe
Levisticum officinale
Origin: Introduced
Lewisia columbianaColumbia lewisia
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Montana.
Habitat: Open gravelly or rocky slopes and rock crevices at mid- to high elevations in the mountains.
Origin: Native
Flowers: May-August
var. columbiana – Columbia lewisia
var. rupicola – Columbia lewisia
Lewisia cotyledonSiskiyou lewisia
Origin: Introduced
Lewisia nevadensisNevada bitterroot
Distribution: Olympic and Cascade Mountains of Washington, south to California.
Habitat: Open, often gravelly, moist to mesic areas at moderate elevations in the mountains to above tree line.
Origin: Native
Flowers: Late May - August
Lewisia pygmaealeast, alpine lewisia, dwarf lewisia
Distribution: Occurring in the Olympic and Cascade Mountains of Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Open, often gravelly, moist to rather dry areas, mid- to high elevations in the mountains.
Origin: Native
Flowers: May-August
Lewisia redivivabitterroot
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia south to California, east to Montana, Wyoming, Utah, and Colorado.
Habitat: Open gravelly and rocky areas from sagebrush plains to moderate elevations in the mountains.
Origin: Native
Flowers: April-June
var. rediviva – bitterroot
Lewisia triphyllathree leaf bitterroot, three leaf lewisia
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to California, east to Montana and south in the Rocky Mountains.
Habitat: Open, usually sandy areas where vernally moist, ponderosa pine forests to subalpine meadows.
Origin: Native
Flowers: May-August
Lewisiopsis tweedyiTweedy's lewisia
Distribution: Occurring in Kittitas, Chelan, and Okanogan counties in Washington; endemic to southern British Columbia and north-central Washington.
Habitat: Rock outcroppings and dry slopes of open Ponderosa pine/Douglas fir forests.
Origin: Native
Flowers: April-June
Leymus cinereusGreat Basin lyme grass
Distribution: East of the Cascades in Washington; central and western North America.
Habitat: Sagebrush-steppe, arid grasslands, forest edges, and other dry, open areas in the intermountain west.
Origin: Native
Flowers: June-July
Leymus condensatusgiant wildrye
Origin: Native
Leymus flavescenssand lyme grass
Origin: Native
Flowers: June - July
Leymus mollisAmerican dunegrass
Distribution: Coastal areas of Washington; Alaska south to California; northern areas of North America.
Habitat: Coastal sand dunes, marshes, headlands.
Origin: Native
Flowers: June-August
ssp. mollis – yellow ryegrass
Leymus racemosusmammoth lyme grass
Origin: Introduced
Flowers: July - August
Leymus triticoidesbeardless lyme grass
Origin: Native
Flowers: June - August
Leymus ×vancouverensisVancouver wildrye
Origin: Native
Ligusticum apiifoliumcelery-leaf wild lovage
Distribution: West of the Cascades, Washington to central California.
Habitat: Thickets, fence rows, sparcely-wooded slopes and prairies.
Origin: Native
Flowers: May - July
Ligusticum canbyiCanby's wild lovage
Distribution: On both sides of the Cascades crest in Washington; east to Montana and Wyoming, south to Oregon.
Habitat: Wet to somewhat dry soil, from montane to subalpine and alpine areas.
Origin: Native
Flowers: May-August
Ligusticum grayiGray's lovage, sheep wild lovage
Distribution: Widely distributed throughout the mountain regions of Washington; east to Idaho, south to California and Nevada.
Habitat: Moist or sometimes dry open slopes and drier meadows in subalpine and alpine areas.
Origin: Native
Flowers: July-September
Ligustrum ×iboleum
Origin: Introduced
Ligustrum obtusifolium
Origin: Introduced
Ligustrum ovalifoliumCalifornia privet
Origin: Introduced
Ligustrum sinense
Origin: Introduced
Ligustrum vulgarecommon privet
Distribution: Occurring west of the Cascades in Washington; British Columbia south to Texas, east to the Atlantic Coast
Habitat: At low elevations in forest understory, forest and prairie edges, and disturbed areas.
Origin: Introduced
Flowers: April-May
Lilaeopsis occidentaliswestern grasswort, western lilaeopsis
Distribution: Southern Vancouver Island to California, including the Puget Sound region.
Habitat: Marshes, salt flats, muddy or sandy beaches and shores along and near the coast
Origin: Native
Flowers: June - July
Lilium columbianumColumbian lily
Distribution: Widely distributed throughout Washington; British Columbia south to California, east to Idaho.
Habitat: Prairies, woods and coniferous forests, sea level to mid-elevations in drier areas.
Origin: Native
Flowers: May-August
Limnanthes albawhite meadowfoam
Origin: Introduced
Limnanthes douglasiiDouglas's meadow-foam
Origin: Introduced
Limnobium laevigatumfrogbit
Distribution: Known from Pacific County in Washington; also known from California and eastern U.S.
Habitat: Lowland ponds, where found floating on water's surface.
Origin: Introduced
Flowers: June-September
Limonium californicumwestern marsh-rosemary
Distribution: Recently (2016) collected in Whatcom county; Oregon south along coast through California to Baja California, Mexico.
Habitat: Coastal salt marshes
Origin: Introduced from Oregon or California
Flowers: July-September
Limosella acaulisstemless mudwort
Origin: Native
Limosella aquaticaawl-leaf mudwort
Distribution: Widespread in the Northern Hemisphere; found throughout the Pacific Northwest.
Habitat: In shallow water or wet mud, in the valleys and plains.
Origin: Native
Flowers: June - October
Linanthus pungensprickly phlox
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Baja California, east to Montana and New Mexico.
Habitat: Dry, open, sandy or rocky places, from the deserts and plains to moderate elevations in the drier mountains.
Origin: Native
Flowers: May-July
Linaria bipartita
Origin: Introduced
Linaria dalmaticadalmation toadflax
Distribution: Widely distributed throughout Washington, but more prevalent east of the Cascades crest; widely distributed throughout most of North America except southeastern region.
Habitat: Open areas roadsides, fields, wastelots, forest openings, typically where disturbed.
Origin: Introduced
Flowers: May-August
ssp. dalmatica – brown-leaved toadflax, Dalmatian toadflax, dalmatian toadflax
Linaria genistifoliabroomleaf toadflax
Origin: Introduced
Linaria grandifloralarge-flowered linaria
Origin: Introduced
Linaria maroccanaMoroccan toadflax
Origin: Introduced
Linaria purpureapurple toadflax
Distribution: Introduced as an ornamental, occasionally escaping west of the Cascades in Washington.
Habitat: Bare and disturbed ground.
Origin: Introduced from Mediterranean
Flowers: June - August
Linaria vulgarisgreater butter-and-eggs
Distribution: Widely distributed across Washington; widely distributed throughout North America.
Habitat: Noxious weed of roadsides, wastelots, and disturbed areas.
Origin: Introduced from Europe
Flowers: June-September
Lindernia dubiafalse pimpernel
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Disturbed, open soil, often where moist near ponds, lakes, and streams, from low to middle elevations.
Origin: Native
Flowers: May-October
Linnaea borealis
Distribution: In the forests and mountains throughout Washington; Alaska south to California, east in North America to the Atlantic Coast.
Habitat: Open to rather dense woods, low to mid-elevations in the mountains.
Origin: Native
Flowers: June-September
ssp. longiflora – American twinflower, longtube twinflower
Linum lewisiiwild blue flax
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of western North America.
Habitat: Dry, open areas from prairies to alpine ridges.
Origin: Native
Flowers: May-July
var. lewisii – wild blue flax
Linum perenneblue garden flax
Origin: Introduced
Linum rigidumyellow flax, large-flowered yellow flax
Origin: Native
Linum usitatissimumlinseed
Origin: Introduced
Flowers: June - November
Liparis loeseliifen orchid, Loesel's twayblade
Distribution: Occasional, Saskatchewan to Nova Scotia, south to North Dakota and Iowa; Klickitat and Yakima Counties in Washington.
Habitat: Around springs and in bogs.
Origin: Native
Flowers: July - August
Lipocarpha aristulatahalfchaff sedge
Distribution: Occurring along the Columbia River in central and south-central Washington; Washington to California and Arizona, east in Great Plains and central U.S.
Habitat: sandy soils of shorelines, stream banks, ponds, and ditches.
Origin: Native
Flowers: June-August
Lipocarpha micranthasmall-flowered halfchaff edge
Origin: Native
Flowers: June - September
Lipocarpha occidentaliswestern halfchaff sedge
Origin: Native
Flowers: June - September
Lithophragma glabrumbulbiferous prairie star, bulbous woodlandstar
Distribution: East of the Cascades in Washington; British Columbia to California, east to the Dakotas and Colorado.
Habitat: Grasslands and sagebrush desert to ponderosa pine and Douglas fir forests.
Origin: Native
Flowers: March-May
Lithophragma parviflorumsmall-flowered prairie star
Distribution: Widely distributed throughout Washington; British Columbia south to California, east to the Rocky Mountains and Great Plains.
Habitat: Prairies, sagebrush desert and forest openings, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: March-June
Lithophragma tenellumslender woodlandstar
Distribution: East side of the Cascades in Washington; British Columbia south to California, east to the Rocky Mountain states.
Habitat: Sagebrush desert and ponderosa pine forests.
Origin: Native
Flowers: May-June
Lithospermum incisumfringed stoneseed
Origin: Native
Lithospermum ruderalewestern gromwell, Columbian puccoon, western stoneseed
Distribution: Common east of the Cascades in southern British Columbia, Washington and Oregon
Habitat: Shrub-steppe to open, dry areas in the mountains at mid-elevations
Origin: Native
Flowers: April - June
Lloydia serotinaalpine lily
Distribution: In the Olympic and Cascade mountains of Washington; Alaska south to Oregon, east to Montana and Alberta, and south in the Rockies to New Mexico.
Habitat: Gravelly ridges, cliffs and rock crevices at high elevations.
Origin: Native
Flowers: June-September
var. serotina – alpine lily
Lobelia dortmannawater lobelia
Distribution: West of the Cascades in Washington; Vancouver Island and adjacent mainland in British Columbia, south to the Cascades of northern Oregon.
Habitat: In shallow water at the margins of ponds and lakes.
Origin: Native
Flowers: June-August
Lobelia erinustrailing lobelia
Origin: Introduced
Lobelia kalmiibrook lobelia
Origin: Native
Flowers: July - August
Lobularia maritimasweet alison, sweet alyssum
Distribution: Occurring in scattered locations across Washington; British Columbia south to Texas; also occurring throughout central and eastern North America.
Habitat: Escaping from cultivation to roadsides, pastures, and other disturbed areas, often where moist.
Origin: Introduced from the western Mediterranean
Flowers: April-August
Loeflingia squarrosaspreading pygmyleaf
Origin: Native
Logfia gallicadaggerleaf cottonweed
Origin: Introduced
Logfia minimalittle cottonrose, small cudweed
Distribution: Native to northern Europe
Habitat: Heaths, sandy areas
Origin: Introduced from Europe
Flowers: June-Sept.
Lolium multiflorumannual ryegrass, Italian ryegrass, perennial ryegrass
Distribution: Introduced and well established in much of temperate North America.
Habitat: Roadsides and waste ground.
Origin: Introduced
Flowers: May - July
Lolium perenneEnglish ryegrass, perennial ryegrass
Distribution: Commonly cultivated as a forage plant; escaped and well established in the Pacific Northwest.
Habitat: Old fields, roadsides, and waste places.
Origin: Introduced
Flowers: May - July
Lolium temulentumdarnel, tare
Origin: Introduced
Flowers: May - June
ssp. temulentum – darnel
Lomatium ambiguumstreambank desert-parsley, swale desert-parsley, lacy lomatium
Distribution: Chiefly east of the Cascades in Washington; southern British Columbia south to northeast Oregon, east to western Montana.
Habitat: Open, often rocky slopes and flats, from the foothills to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Lomatium anomalumnine-leaf lomatium
Origin: Native
Lomatium bradshawiiBradshaw's desert-parsley
Distribution: Willamette Valley of Oregon from near Salem to near Eugene.
Habitat: Low, moist ground.
Origin: Native
Flowers: May
Lomatium brandegeeiBrandegee's desert-parsley
Distribution: Chiefly east of the Cascades in Washington;
Habitat: Open to wooded slopes, moderate to fairly high elevations in the mountains; southern British Columbia south to Washington.
Origin: Native
Flowers: May-July
Lomatium brevifoliumnarrowfruit biscuit-root
Origin: Native
Lomatium canbyichucklusa, Canby's desert-parsley
Distribution: Along Columbia River in NE Washington, common from Kittitas County south into Oregon
Habitat: Scablands and sagebrush steppe in rather deep soil
Origin: Native
Flowers: March - April
Lomatium columbianumColumbia Gorge desert-parsley
Distribution: At the east end of the Columbia River Gorge in Washington; Washington south to northern Oregon.
Habitat: Deeper soil in shrub-steppe.
Origin: Native
Flowers: March-April
Lomatium couscous, cous-root desert-parsley
Distribution: Southeast Washington and northeast Oregon,east through Idaho to Montana and Wyoming
Habitat: Dry, open, often rocky places often with sagebrush; common at low elevations, occasionally found much higher
Origin: Native
Flowers: April - July
Lomatium cuspidatumWenatchee desert-parsley, Wenatchee Mountain lomatium
Distribution: Endemic to the Wenatchee Mountains of Chelan and Kittitas Counties, Washington.
Habitat: Open, rocky slopes, often on serpentine, between 2500-6000 ft.
Origin: Native
Flowers: May-July
Lomatium dissectumfern-leaved desert parsley
Distribution: Chiefly west of the east base of the Cascades, British Columbia to California
Habitat: Open areas from the foothills to moderate elevations in the mountains
Origin: Native
Flowers: April - June
Lomatium farinosumHamblen's lomatium
Distribution: Chelan to Yakima Counties, Washington, east to Montana.
Habitat: Rocky slopes and scablands, often on lithosol and with sagebrush.
Origin: Native
Flowers: April - May
Lomatium geyeriGeyer's desert-parsley
Distribution: Chiefly east of the Cascades in Washington; southern British Columbia south to Washington, east to Idaho.
Habitat: Deeper soil in low to mid-elevations of open, dry areas, and under Ponderosa pine.
Origin: Native
Flowers: March-May
Lomatium gormaniiGorman's desert-parsley, salt and pepper
Distribution: East of the Cascades in Washington; Washington south to Oregon, east to Idaho.
Habitat: Open slopes and scablands in the foothills, valleys and plains, often with sagebrush.
Origin: Native
Flowers: March-May
Lomatium grayiGray's lomatium, milfoil lomatium
Distribution: Widespread east of the Cascades from low to moderate elevations in Washington; British Columbia south to Nevada, east to the Rocky Mountains.
Habitat: Typically in rocky draws where moist in spring, also on rock outcrops.
Origin: Native
Flowers: April-May
Lomatium knokeiKnoke's biscuit-root
Distribution: Known only from Kittitas County in Washington.
Habitat: Open, vernally wet, gently sloping meadows of fine-textured clay soils at approximately 1200 meters.
Origin: Native
Flowers: May-June
Lomatium laevigatumslickrock desert-parsley, smooth lomatium
Distribution: Along the Columbia River in Klickitat County, Washington, and adjacent Oregon.
Habitat: Crevices is basalt cliffs.
Origin: Native
Flowers: April
Lomatium leptocarpumgumbo-lomatium
Origin: Native
Flowers: May - June
Lomatium linearifoliaGreat Basin Indian-potato, linear-leaved orogenia
Distribution: Eastern Washington and Oregon, southeast to Colorado
Habitat: Open slopes and ridges, low to mid-elevations
Origin: Native
Flowers: March - May
Lomatium lithosolamansHoover's tauschia, Hoover's umbrella-wort
Origin: Native
Lomatium macrocarpumlarge-fruit desert-parsley, bigseed lomatium
Distribution: East of the Cascades in Washington; British Columbia south to California, east to North Dakota, Wyoming and Utah.
Habitat: Open, dry, rocky areas at low elevations.
Origin: Native
Flowers: March-May
Lomatium martindaleiCascade desert-parsley, coast range lomatium
Distribution: Distributed on both sides of the Cascades in Washington; British Columbia south to Oregon.
Habitat: Dry mountain meadows, often rocky areas.
Origin: Native
Flowers: May-September
Lomatium multifidumfern-leaved desert parsley
Distribution: East of the Cascades, British Columbia to Oregon, east to Wyoming
Habitat: Open, often rocky slopes and dry meadows, low to mid-elevations
Origin: Native
Flowers: April - June
Lomatium nudicauleIndian-consumption-plant, barestem lomatium, pestle parsnip
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Utah.
Habitat: Dry, open areas; common in shrub-steppe, but found in mountain meadows.
Origin: Native
Flowers: April-June
Lomatium piperiPiper's lomatium
Distribution: East of the Cascades in Washington; central Washington south to northern California.
Habitat: Sagebrush-bunchgrass steppe up to ponderosa pine forests.
Origin: Native
Flowers: April-June
Lomatium quintuplexUmptanum desert-parsley
Distribution: Endemic to eastern Kittitas County and northeastern Yakima County, Washington.
Habitat: Principally lithosol areas in the shrub-steppe.
Origin: Native
Flowers: March-May
Lomatium rollinsiiRollins' desert-parsley
Distribution: Canyons of the Snake and lower Salmon Rivers, eastern Oregon and western Idaho.
Habitat: Open slopes.
Origin: Native
Flowers: April
Lomatium salmoniflorumSalmon River desert-parsley
Distribution: Near the Snake and Clearwater Rivers in Idaho, Latah and Nez Perce Counties, Idaho, and Whitman County west to Palouse Falls, Washington.
Habitat: Open, rocky slopes.
Origin: Native
Flowers: March - April
Lomatium sandbergiiSandberg's biscuit-root
Origin: Native
Lomatium serpentinumSnake Canyon desert-parsley
Distribution: Near the Snake River Canyon, western Idaho, eastern Oregon and extreme southeast Washington.
Habitat: Open, often rocky slopes.
Origin: Native
Flowers: April - July
Lomatium simplexnine-leaf biscuit-root
Distribution: East of the Cascades in Washington; widely distributed east of the Continental Divide in Montana south to Colorado.
Habitat: Dry, open areas at low elevations.
Origin: Native
Flowers: March-May
Lomatium suksdorfiiSuksdorf's desert-parsley
Distribution: Endemic in Klickitat County, Washington
Habitat: Dry, open slopes
Origin: Native
Flowers: April-May
Lomatium tamanitchiiribseed biscuit-root
Origin: Native
Lomatium tenuissimumLeiberg's umbrella-wort
Origin: Native
Flowers: April - May
Lomatium thompsoniiThompson's desert-parsley
Origin: Native
Flowers: June
Lomatium triternatumtriternate biscuit-root
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Dry to somewhat moist open areas, low to mid-elevations.
Origin: Native
Flowers: April-July
Lomatium tuberosumpotato desert-parsley, Hoover's lomatium
Distribution: Scattered locations in Yakima County, Washington, and adjacent counties.
Habitat: Rocky slopes and talus.
Origin: Native
Flowers: March - April
Lomatium utriculatumbladder desert-parsley, spring gold, fine-leaved desert parsley
Distribution: West of the Cascades in Washington;British Columbia south to California.
Habitat: Low elevations; somewhat moist, open, often rocky areas.
Origin: Native
Flowers: April-June
Lomatium watsoniiWatson's desert-parsley
Distribution: Soluthern Kittitas County, south through Yakima and Klickitat Counties, to northcentral Oregon.
Habitat: Open hillsides, often with sagebrush.
Origin: Native
Flowers: May
Lonicera ×bellashowy fly honeysuckle
Origin: Introduced
Lonicera caurianabluefly honeysuckle, sweet-berry honeysuckle
Distribution: Reported from Washington; Alaska to California, also in Idaho.
Origin: Native
Lonicera ciliosaorange honeysuckle
Distribution: Ranging throughout Washington; British Columbia south to Oregon, east to Montana.
Habitat: Open to rather dense woods, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Lonicera conjugialispurple-flower honeysuckle
Distribution: Mt. Adams south chiefly through the east side of the Cascades in Washington; south to the Sierra Nevada of California.
Habitat: In woods, meadows and moist open slopes at mid-elevations in the mountains.
Origin: Native
Flowers: June-July
Lonicera etruscaEtruscan honeysuckle
Distribution: Occasional west of the Cascades in Washington; established along the Oregon coast and southern British Columbia.
Habitat: Thickets and waste areas.
Origin: Introduced
Flowers: June-August
Lonicera hispidulahairy honeysuckle
Distribution: West of the Cascades in Washington; British Columbia to Oregon.
Habitat: Open woods at low elevations.
Origin: Native
Flowers: June-August
Lonicera involucratabearberry honeysuckle, black twin-berry
Distribution: Both sides of the Cascades in Washington; Alaska south to California, east to Montana and New Mexico.
Habitat: Common in open woods at low to mid-elevations.
Origin: Native
Flowers: April-August
var. involucrata – bearberry, black twin-berry, twinberry
Lonicera japonicaJapanese honeysuckle
Distribution: Occasionally escaped from cultivation in lowland western Washington; California east through the midwestern, southeastern, and northeastern U.S.
Habitat: Disturbed areas, woods, and thickets.
Origin: Introduced
Flowers: May-July
Lonicera maackiiAmur honeysuckle
Origin: Introduced
Lonicera periclymenumwoodbine
Origin: Introduced
Lonicera pileata
Origin: Introduced
Lonicera tataricaTartarian honeysuckle
Distribution: Scattered localities throughout Washington; throughout much of North America except the southeastern U.S.
Habitat: Disturbed areas, woods, and thickets.
Origin: Introduced from Eurasia
Flowers: May-July
Lonicera utahensisRocky Mountain honeysuckle, Utah honeysuckle
Distribution: Both sides of the Cascades in Washington; British Columbia to Oregon, east to Montana and south in the Rockies to Arizona.
Habitat: Mid- to high elevations in the mountains.
Origin: Native
Flowers: May-July
Lonicera xylosteumEuropean fly honeysuckle
Origin: Introduced
Lotus corniculatusgarden bird's-foot-trefoil
Distribution: Occurring on both sides of the Cascades in Washington; widely distributed throughout most of North America.
Habitat: Mesic to wet areas, typically where disturbed.
Origin: Introduced
Flowers: May-September
Lotus tenuisnarrow-leaved trefoil
Origin: Introduced
Lotus uliginosusbig lotus, big trefoil, large trefoil
Distribution: West of the Cascades in Washington; British Columbia south to California, east to Idaho; east across Canada to Nova Scotia; scattered localities in eastern U.S.
Habitat: Moist to wet disturbed areas, roadsides, abandoned lots, and coastal tidelands.
Origin: Introduced
Flowers: May-July
Ludwigia hexapetalafalse loosestrife, water primrose
Distribution: Scattered locations throughout Washington; along Columbia River near Portland, OR, introduced in much of North America.
Habitat: Swamps, lakes, and streams.
Origin: Introduced from South America
Flowers: June-August
Ludwigia palustrismarsh primrose-willow
Distribution: West side of the Cascades and along the Columbia River in Washington; widespread in North America, Africa and Eurasia.
Habitat: Marshes and bogs.
Origin: Native
Flowers: July-September
Ludwigia peploidesfloating primrose-willow
Origin: Introduced
ssp. montevidensis – floating primrose-willow
Luetkea pectinatalutkea, partridgefoot
Distribution: Occurring in the Olympics and Cascades mountains in Washington; Alaska south to California, and in the Rocky Mountains.
Habitat: Usually on sandy soil in moist or shady places, subalpine to alpine.
Origin: Native
Flowers: June-August
Luina hypoleucalittleleaf luina, silverback luina, littleleaf silverback
Distribution: In the Olympic and Cascade mountains in Washington; British Columbia south to California.
Habitat: Open, rocky areas, moist to somewhat dry, moderate to high elevations in the mountains.
Origin: Native
Flowers: June-October
Lunaria annuahonesty, money plant
Distribution: Distributed in scattered locations across Washington; British Columbia south to California and Utah; also distributed throughout eastern North America.
Habitat: Escaping from cultivation to urban forests, roadsides, and other disturbed areas.
Origin: Introduced from southeast Europe
Flowers: March-June
Lupinus albicaulissicklekeel lupine
Distribution: Chiefly west of the Cascades in Washington; Washington south to California.
Habitat: Grasslands and prairies from the lowlands to moderate elevations.
Origin: Native
Flowers: May-July
Lupinus arboreustree lupine, yellow-bush lupine
Distribution: Occurring in the western Washington lowlands and along the Pacific coast; British Columbia south to California.
Habitat: Sandy soil.
Origin: Introduced
Flowers: May-September
Lupinus arbustussilvery lupine, spurred lupine
Distribution: East of the Cascades crest in Washington; British Columbia south to California, east to Montana and Utah.
Habitat: Sagebrush deserts and ponderosa pine forest openings.
Origin: Native
Flowers: May-July
Lupinus argenteussilvery lupine
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to the Dakotas and New Mexico.
Habitat: Ponderosa pine forests to subalpine ridges.
Origin: Native
Flowers: May-July
var. argenteus – silvery lupine
Lupinus bicolorsmall-flower lupine, two-color lupine
Distribution: Chiefly west of the Cascades in Washington, but also in southeastern part of state; British Columbia south to California, east to Arizona.
Habitat: Open meadows, grasslands, prairies, and sandy riverbanks at low to moderate elevations.
Origin: Native
Flowers: April-July
Lupinus latifoliusbroadleaf lupine
Distribution: In the Olympic and Cascade mountains of Washington; British Columbia south to California.
Habitat: Chiefly in forest openings at mid-elevation to subalpine meadows.
Origin: Native
Flowers: June-August
var. latifolius – broadleaf lupine, Suksdorf's lupine
var. subalpinus – broadleaf lupine
Lupinus lepidusprairie lupine
Distribution: Widely distributed throughout Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: Open areas from low elevations to the alpine.
Origin: Native
Flowers: June-August
var. aridus – prairie lupine
var. cusickii – elegant lupine
var. lepidus – Pacific lupine
var. lobbii – elegant lupine
Lupinus leucophyllusvelvet lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Montana, Wyoming, and Colorado.
Habitat: Shrub-steppe and ponderosa pine forests.
Origin: Native
Flowers: June-August
var. leucophyllus – velvet lupine
var. tenuispicus – velvet lupine
Lupinus littoralisseashore lupine
Distribution: Coastal from British Columbia to California
Habitat: Near the shore along the coast
Origin: Native
Flowers: May - August
Lupinus microcarpuschick lupine
Distribution: Chiefly west of the Cascades in Washington, though also known from east of Cascades; British Columbia south to California.
Habitat: Coastal bluffs, grassy balds, and other dry, open areas at low elevations.
Origin: Native
Flowers: April-June
var. microcarpus – chick lupine
Lupinus nootkatensisNootka lupine
Origin: Native
Lupinus oreganusOregon lupine
Distribution: West of the Cascades in Washington; south to Willamette Valley in Oregon.
Habitat: Moist to dry areas of prairies and openings in oak woodlands.
Origin: Native
Flowers: April-June
var. kincaidii – Kincaid's lupine, sulphur lupine
Lupinus pachylobusbig-pod lupine
Origin: Native?
Lupinus polyphyllusbigleaf lupine, large-leaved lupine
Distribution: Widely distributed throughout Washington; British Columbia south to California, east to Colorado.
Habitat: Moist areas and stream banks, low to fairly high elevations.
Origin: Native
Flowers: June-September
var. burkei – large-leaved lupine, many-leaved lupine
var. humicola – Wyeth's lupine
var. pallidipes – large-leaved lupine
var. polyphyllus – large-leaved lupine
var. prunophilus – large-leaved lupine
Lupinus pusilluslow lupine, rusty lupine
Distribution: Occurring east of the Cascades crest in south-central Washington; Washington south to California, east to the Rocky Mountains and Great Plains of Canada and the U.S.
Habitat: Shrub-steppe habitat, often where sandy.
Origin: Native
Flowers: May-June
var. intermontanus – low lupine, rusty lupine
Lupinus rivularisriver-bank lupine
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California.
Habitat: Gravelly prairies, open woods and river banks at low elevations.
Origin: Native
Flowers: April-September
Lupinus sabinianusSabin's lupine
Distribution: Blue Mountains of southeast Washington; south to northeast Oregon.
Habitat: Forest openings and grasslands at low to moderate elevations.
Origin: Native
Flowers: May-June
Lupinus saxosusrock lupine
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho and Nevada.
Habitat: Shrub-steppe habitat.
Origin: Native
Flowers: April-May
Lupinus sericeussilky lupine
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to Oregon, east to Alberta and south to Arizona.
Habitat: Sagebrush deserts to forest openings at moderate elevations.
Origin: Native
Flowers: May-August
var. asotinensis – Asotin silk lupine
var. sericeus – silky lupine
Lupinus sulphureussulfur lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California.
Habitat: Shrub-steppe, grassland, and open ponderosa pine forests.
Origin: Native
Flowers: April-June
var. subsaccatus – Bingen lupine
var. sulphureus – sulphur lupine
Luzula arcuatacurved woodrush
Distribution: Alaska, British Columbia, and Mt. Rainier, Washington.
Habitat: Rocky or gravelly soil, usually on moraines or above timberline.
Origin: Native
Flowers: July - August
ssp. unalaschcensis – curved woodrush
Luzula campestrisfield woodrush
Origin: Introduced
ssp. campestris – field woodrush
Luzula cascadensisCascades woodrush
Origin: Native
Luzula comosa
Distribution: Uncommon west of the Cascades, British Columbia to California
Habitat: Gravelly prairies to moist, shaded areas in the lowlands
Origin: Native
Flowers: April - July
var. comosa – pale woodrush
var. laxa – Pacific woodrush
Luzula forsterisouthern woodrush
Origin: Introduced
ssp. forsteri – southern woodrush
Luzula hitchcockiiHitchcock's woodrush, smooth woodrush
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia south to Crater Lake and the Wallowa Mountains of Oregon, east to Alberta, Idaho and Montana.
Habitat: Montane forests to alpine slopes, ridges and meadows.
Origin: Native
Flowers: July-September
Luzula macranthalarge-anthered woodrush, prairie woodrush
Origin: Native
Luzula multifloracommon woodrush
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to Oregon, east to Alberta and western Montana; also in northeastern United States.
Habitat: Fields, meadows, open woods and clearings, at low to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Luzula niveasnowy woodrush
Origin: Introduced from Europe
Luzula parviflorasmall flowered woodrush
Distribution: Alaska to Newfoundland, south to southern California and New York.
Habitat: Moist to fairly dry areas, coastal rain forest to alpine slopes.
Origin: Native
Flowers: May - August
Luzula piperiPiper's woodrush
Origin: Native
Luzula spicataspiked woodrush
Origin: Native
ssp. spicata – spiked woodrush
Luzula subsessilisshort-stalked wood-rush
Origin: Native
Luzula sylvaticagreat woodrush
Origin: Introduced
Lychnis coronariarose campion
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Utah; eastern North America.
Habitat: Along roadways, railways and waste land.
Origin: Introduced
Flowers: June-August
Lycium barbarummatrimony-vine
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed ground.
Origin: Introduced from Eurasia
Flowers: June-September
Lycium chinenseChinese wolfberry
Origin: Introduced
Lycopodiella inundatabog clubmoss, marsh clubmoss, northern bog clubmoss
Distribution: Occurring west of the Cascades crest in Washington; Alaska south to California; in scattered locations in north central Canada; from Minnesota and Ontarioa east to the Atlantic Coast.
Habitat: Wet areas, pond and lakeshores from low to middle elevations in the mountains.
Origin: Native
Lycopodium clavatumcommon clubmoss, elk-moss, stag, ground pine, running pine
Distribution: Both sides of the Cascades in Washington; British Columbia south to California in western North America; circumboreal.
Habitat: Moist coniferous woods and swamps.
Origin: Native
Spores: Produces spores April-October
Lycopodium lagopusptarmigan clubmoss, one-cone ground-pine
Origin: Native
Lycopsis arvensisannual bugloss, European bugloss, small bugloss
Origin: Introduced from Europe
Lycopus americanuscut-leaf water-horehound
Distribution: Both sides of the Cascades in Washington; throughout most of North America.
Habitat: Nonalkaline wetland, riparian, pond and lakeshore sites at low to moderate elevations.
Origin: Native
Flowers: June-August
Lycopus asperrough water-horehound
Distribution: Chiefly east of the Cascades; southern British Columbia to California, east to Colorado and Minnisota.
Habitat: Marshes and shores of streams and lakes; tolerant of alkali.
Origin: Native
Flowers: June-August
Lycopus europaeusEuropean water-horehound
Origin: Introduced from Europe
Lycopus uniflorusnorthern bugleweed
Distribution: Both sides of the Cascades in Washington; Alaska to Newfoundland, south to northwest California and North Carolina.
Habitat: Stream banks, marshes and peat bogs, mostly in the mountains, but descending to sea level west of the Cascades.
Origin: Native
Flowers: July-September
Lygodesmia juncearush skeletonplant
Distribution: Known from Spokane County in Washington; southeastern British Columbia to eastern Washington, Idaho and Nevada, east to Great Plains and Great Lakes region.
Habitat: Dry, open places, often in sandy soil.
Origin: Native
Flowers: June-September
Lysichiton americanusskunk cabbage, yellow skunk cabbage
Distribution: Both sides of the Cascades in Washington; Alaska south to California.
Habitat: Swampy areas from sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Lysimachia arvensisscarlet pimpernel
Distribution: Scattered locations on both sides of the Cascades in Washington; widely distributed throughout North America.
Habitat: Weed of disturbed open areas, waste ground.
Origin: Introduced
Flowers: May-June
Lysimachia ciliatafringed yellow-loosestrife
Distribution: Chiefly east of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Moist woods, prairies, meadows, stream banks, roadsides.
Origin: Native
Flowers: June-August
Lysimachia europaeaarctic starflower, northern starflower
Distribution: Both side of the Cascades in Washington; Alaska south to California, east to Alberta and Idaho.
Habitat: Bogs and swamps, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Lysimachia hybridalance-leaved yellow loosestrife, lowland loosestrife, Mississippi loosestrife, lowland yellow-loosestrife
Origin: Introduced
Lysimachia latifoliabroad-leaved starflower, western starflower
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory south to California, east to Idaho.
Habitat: Woods and prairies, low to moderate elevations in the mountains.
Origin: Native
Flowers: March-July
Lysimachia maritimasea milkwort, sea-milkwort
Distribution: Chiefly west of the Cascades in Washington; circumboreal; Alaska to California, east to Newfoundland, south in eastern North America to Virginia.
Habitat: Coastal tideflats and saline areas.
Origin: Native
Flowers: April-June
Lysimachia minimachaffweed
Distribution: Chiefly east of the Cascades in Washington, though also found near the coast; throughout much of North America.
Habitat: Moist ground and vernal pools at low elevations.
Origin: Native
Flowers: May-June
Lysimachia nummulariacreeping-Jenny
Distribution: Scattered locations west of the Cascades in Washington; British Columbia south to California and Nevada; occurring in central U.S and eastern North America.
Habitat: Moist, disturbed ground along lakes, ponds, roadsides and near gardens.
Origin: Introduced
Flowers: June-August
Lysimachia punctatalarge yellow-loosestrife
Distribution: Scattered localities across Washington; British Columbia south Oregon, east to Montana; scattered throughout central and eastern North America.
Habitat: Old fields, roadsides and stream banks.
Origin: Introduced
Flowers: July-August
Lysimachia terrestrisswampcandles
Distribution: Along the coast in Washington; British Columbia south to Oregon and Idaho; native and abundant in central and eastern North America.
Habitat: Cultivated cranberry bogs, and swamps.
Origin: Introduced from eastern North America
Flowers: June-August
Lysimachia thyrsifloratufted yellow-loosestrife
Distribution: Distributed on both sides of the Cascades in Washington; Alaska south to California, eastern North America.
Habitat: Swamps, lakes and ditches.
Origin: Native
Flowers: May-July
Lysimachia vulgarisgarden yellow-loosestrife
Distribution: Occurring in scattered localities on both sides of the Cascades in Washington; British Columbia to Oregon, east to Montana; widely distributed in eastern North America.
Habitat: Uncommon garden escape of moist areas, lake and pond margins, and riparian zones.
Origin: Introduced from Europe
Flowers: June-August
Lythrum hyssopifoliahyssop loosestrife
Distribution: Scattered locations on both sides of the Cascades in Washington; British Columbia south to California; eastern North America.
Habitat: Moist, disturbed areas.
Origin: Introduced
Flowers: May-September
Lythrum portulaspatula-leaf loosestrife
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to California.
Habitat: Wetlands, disturbed moist areas.
Origin: Introduced
Flowers: June-September
Lythrum salicariapurple loosestrife, long purples
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Noxious weed of standing water and wet ground.
Origin: Introduced from Europe
Flowers: July-September